Lucia Whalen, whose 911 call led to the arrest of the Harvard professor Henry Louis Gates Jr. at his home, made her first public comments Wednesday, saying that at no time had she mentioned race to the responding police officer.

Ms. Whalen's statements contradict the police report filed by Sgt. James Crowley, who said she told him outside Mr. Gates's home that she had seen "what appeared to be two black males with backpacks" on the porch of the yellow single-family house.

Ms. Whalen said that the only words she exchanged with Sergeant Crowley in person were, "I was the 911 caller." She said that he responded, "Stay right there."